PyMeshLab | The open source mesh processing python library | Service Mesh library

I am new to meshlab, I can not find the function in meshlabsever or pymeshlab, and I want to take the snapshot in obj files.enter image description here

I am new to this area. I have a list of 3D points(xyz coordinates) stored in a txt file. I want to find/build meshes/surface using those points. I know the meshlab surface reconstruction feature help with this. I would love to use pymeshlab.

From the documentation, the example just loads an obj file to the Meshset class. I googled that these type of files are usually generated from some 3D models software. I got my data from google ARcore saved manually in txt format. I want to process these points in python with pymeshlab, did pymeshlab read the txt file? If not, what format does it read? How should I convert my txt file to the desired one?

I hope there are more detailed instructions for this.

I wrote a little script, that has the task of loading a mesh (ply), then to apply some filters and finally export the whole thing back as a ply.

So far so good. But the resulting ply-file comes out unreadable. If I try to open it in MeshLab, it says: "Face with more than 3 vertices"

here is the code part that concerns pymeshlab (cleaned):

I'm a newbie of pymeshlab and trying to use this tool to do some batch processing. My question is that how to use pymeshlab to find the total vertex and face number of a mesh?